qrand

#!/usr/bin/env python

### Get one or more true random numbers using the qrng.anu.edu.au quantum
### random number generator through the available API

import argparse
import json
import requests

_DEFAULT_MIN = 0
_DEFAULT_MAX = 2**16
_DEFAULT_LENGTH = 1


def parse_args():
    parser = argparse.ArgumentParser(description='QRand arguments')
    parser.add_argument('min', metavar='min', type=int, nargs='?',
                        default=_DEFAULT_MIN, help='Minimum value (default: 0)')
    parser.add_argument('max', metavar='max', type=int, nargs='?',
                        default=_DEFAULT_MAX, help='Maximum value ' +
                        '(default: 65536, maximum: 65536)')
    parser.add_argument('-l', '--length', dest='length', default=1,
                        help='Number of random numbers that will be returned ' +
                        '(default: 1)')


    return parser.parse_args()


def get_numbers(min=_DEFAULT_MIN, max=_DEFAULT_MAX, length=_DEFAULT_LENGTH):
    URL = 'https://qrng.anu.edu.au/API/jsonI.php'
    response = requests.get(URL, params={
        'type': 'uint16',
        'length': length,
        'size': 1,
    })

    if response.ok:
        return [
            (n % (max-min)) + min
            for n in response.json().get('data', []) ]
    else:
        raise RuntimeError('Request errored with status {}'.
                           format(response.status_code))


def main():
    args = parse_args()
    numbers = get_numbers(min=args.min, max=args.max, length=args.length)
    for n in numbers:
        print(n)


if __name__ == '__main__':
    main()


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